chromium/third_party/blink/web_tests/editing/pasteboard/copy_crossing_editing_boundary.html

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
selection_test(
 '<div contenteditable>^foo</div>bar|',
  selection => {
    assert_own_property(window, 'internals',
                        'This test requires window.internals');
    assert_equals(selection.window.internals.selectedTextForClipboard(), 'foo\nbar');
    assert_equals(selection.window.internals.selectedHTMLForClipboard()
                    .replace(/ style=".+?"/g, ' style="..."'),
                  '<div contenteditable="" style="...">foo</div><span style="...">bar</span>');
  },
  '<div contenteditable>^foo</div>bar|',
  'Selection by script should not be adjusted.');
</script>